bind: Update to 9.16.31

bind: Update to 9.16.31

For details see:
https://downloads.isc.org/isc/bind9/9.16.31/doc/arm/html/notes.html#notes-for-bind-9-16-31

Excerpt from changelog:

"	--- 9.16.31 released ---

5917.	[bug]		Update ifconfig.sh script as is miscomputed interface
			identifiers when destroying interfaces. [GL #3061]

5915.	[bug]		Detect missing closing brace (}) and computational
			overflows in $GENERATE directives. [GL #3429]

5913.	[bug]		Fix a race between resolver query timeout and
			validation in resolver.c:validated(). Remove
			resolver.c:maybe_destroy() as it is no loger needed.
			[GL #3398]

5909.	[bug]		The server-side destination port was missing from dnstap
			captures of client traffic. [GL #3309]

5905.	[bug]		When the TCP connection would be closed/reset between
			the connect/accept and the read, the uv_read_start()
			return value would be unexpected and cause an assertion
			failure. [GL #3400]

5903.	[bug]		When named checks that the OPCODE in a response matches
			that of the request, if there is a mismatch named logs
			an error.  Some of those error messages incorrectly
			used RCODE instead of OPCODE to lookup the nemonic.
			This has been corrected. [GL !6420]"

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>